A generation of sectional images of tissue is provided. In this arrangement a first light-conducting fiber of a device for generating sectional tissue images according to the optical coherence tomography principle, which light-conducting fiber is rotatably accommodated within a catheter tube, is additionally connected to a device for generating light in a further wavelength range and for detecting fluorescent light. With its use sectional tissue images produced according to the optical coherence tomography principle can be superimposed with fluorescent images.